Silicon ChipMarket Centre - May 1992 SILICON CHIP
  1. Outer Front Cover
  2. Contents
  3. Publisher's Letter: PC technology is moving rapidly ahead
  4. Feature: We Take A Look At CD-ROM by Darren Yates
  5. Feature: Computing On The Big Screen by Jim Sharples
  6. Feature: Computer Bits by Paul Lynch
  7. Project: A Low-Cost Electronic Doorbell by Darren Yates
  8. Project: The Eliminator by Marque Crozman
  9. Serviceman's Log: Five faults all at once! by The TV Serviceman
  10. Project: Build A Telephone Intercom by Greig Sheridan
  11. Vintage Radio: The basics of receiver alignment; Pt.2 by John Hill
  12. Project: Infrared Remote Control For Model Railroads, Pt.2 by Leo Simpson & John Clarke
  13. Feature: Amateur Radio by Garry Cratt, VK2YBX
  14. Back Issues
  15. Order Form
  16. Market Centre
  17. Advertising Index
  18. Outer Back Cover

This is only a preview of the May 1992 issue of Silicon Chip.

You can view 47 of the 96 pages in the full issue, including the advertisments.

For full access, purchase the issue for $10.00 or subscribe for access to the latest issues.

Articles in this series:
  • Computer Bits (July 1989)
  • Computer Bits (August 1989)
  • Computer Bits (September 1989)
  • Computer Bits (October 1989)
  • Computer Bits (November 1989)
  • Computer Bits (January 1990)
  • Computer Bits (April 1990)
  • Computer Bits (October 1990)
  • Computer Bits (November 1990)
  • Computer Bits (December 1990)
  • Computer Bits (January 1991)
  • Computer Bits (February 1991)
  • Computer Bits (March 1991)
  • Computer Bits (April 1991)
  • Computer Bits (May 1991)
  • Computer Bits (June 1991)
  • Computer Bits (July 1991)
  • Computer Bits (August 1991)
  • Computer Bits (September 1991)
  • Computer Bits (October 1991)
  • Computer Bits (November 1991)
  • Computer Bits (December 1991)
  • Computer Bits (January 1992)
  • Computer Bits (February 1992)
  • Computer Bits (March 1992)
  • Computer Bits (May 1992)
  • Computer Bits (June 1992)
  • Computer Bits (July 1992)
  • Computer Bits (September 1992)
  • Computer Bits (October 1992)
  • Computer Bits (November 1992)
  • Computer Bits (December 1992)
  • Computer Bits (February 1993)
  • Computer Bits (April 1993)
  • Computer Bits (May 1993)
  • Computer Bits (June 1993)
  • Computer Bits (October 1993)
  • Computer Bits (March 1994)
  • Computer Bits (May 1994)
  • Computer Bits (June 1994)
  • Computer Bits (July 1994)
  • Computer Bits (October 1994)
  • Computer Bits (November 1994)
  • Computer Bits (December 1994)
  • Computer Bits (January 1995)
  • Computer Bits (February 1995)
  • Computer Bits (March 1995)
  • Computer Bits (April 1995)
  • CMOS Memory Settings - What To Do When The Battery Goes Flat (May 1995)
  • Computer Bits (July 1995)
  • Computer Bits (September 1995)
  • Computer Bits: Connecting To The Internet With WIndows 95 (October 1995)
  • Computer Bits (December 1995)
  • Computer Bits (January 1996)
  • Computer Bits (February 1996)
  • Computer Bits (March 1996)
  • Computer Bits (May 1996)
  • Computer Bits (June 1996)
  • Computer Bits (July 1996)
  • Computer Bits (August 1996)
  • Computer Bits (January 1997)
  • Computer Bits (April 1997)
  • Windows 95: The Hardware That's Required (May 1997)
  • Turning Up Your Hard Disc Drive (June 1997)
  • Computer Bits (July 1997)
  • Computer Bits: The Ins & Outs Of Sound Cards (August 1997)
  • Computer Bits (September 1997)
  • Computer Bits (October 1997)
  • Computer Bits (November 1997)
  • Computer Bits (April 1998)
  • Computer Bits (June 1998)
  • Computer Bits (July 1998)
  • Computer Bits (November 1998)
  • Computer Bits (December 1998)
  • Control Your World Using Linux (July 2011)
Items relevant to "Build A Telephone Intercom":
  • Silicon Chip article scan, May 1992 - Telephone Intercom (AUD $10.00)
Articles in this series:
  • The basics of receiver alignment (April 1992)
  • The basics of receiver alignment; Pt.2 (May 1992)
  • The basics of receiver alignment; Pt.3 (June 1992)
Articles in this series:
  • Infrared Remote Control For Model Railroads, Pt.1 (April 1992)
  • Infrared Remote Control For Model Railroads, Pt.2 (May 1992)
  • Infrared Remote Control For Model Railroads, Pt.3 (June 1992)
Articles in this series:
  • Amateur Radio (April 1992)
  • Amateur Radio (May 1992)
MARKET CENTRE Cash in your surplus gear. Advertise it here in Silicon Chip. r----------------------- --, CLASSIFIED ADVERTISING RATES ANTIQUE RADIO Advertising rates for this page: Classified ads: $10.00 for up to 15 words plus 40 cents for each additional word . Display ads (casual rate): $20 per column centimetre (Max. 10cm). Closing date: five weeks prior to month of sale. To run your classified ad, print it clearly on the form below or on a separate sheet of paper & send it with your cheque or credit card details to: Silicon Chip Classifieds, PO Box 139, Collaroy Beach, NSW 2097. Or fax the details to (02) 979 6503. ANTIQUE RADIO restorations. Your one-stop radio repair shop. Specialising in restoring vintage radios including chassis rewiring, re-condensing, quality new parts, valves, valve sockets, speakers, power & audio transformers. Secondhand radio dials & parts for most brands & models. About 400 radios in stock for sale, restoration & parts. Every restored wireless is covered by a 2year warranty on parts & labour. We restore damaged woodwork & cabinets & French polish (approx. 40 coats). Vintage car radios available for sale or restoration . Repairs done on tape decks & amplifiers. Open Sat. 10am-5pm; Sun. 12.30-5pm. 109 Cann St, Bass Hill, NSW 2197. Phone (02) 645 3173 BH or (02) 726 1613 AH. FOR SALE NEED A NEW GENERATION microcontroller? Program in Pascal, C, Turbo Basic, Quick Basic or 8088 Machine Language? The world's first MS-DOS pocket PC is what you need. Video cassette size Atari Portfolio $380. Lowest prices on accessories. For full info, send a 45c stamp to Don McKenzie, 29 Ellesmere Crescent, Tullamarine 3043. Phone(03)3386286. Enclosed is my cheque/money order for $_ _ _ _ or please debit my O Bankcard 0 Visa Card 0 Master Card XI I I Signature_ _ _ _ _ _ _ _ _ _ _ Card expiry date___/_ __ I I Name _ _ _ _ _ __ _ __ _ _ _ _ _ _ _ _ _ __ _ __ I I Street _ _ _ __ __ __ __ _ _ _ _ _ __ __ _ _ __ I I Suburb/town _ _ _ _ _ _ __ __ __ Postcode_ __ __ _ L _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ JI WEATHER FAX programs for IBM XT/ ATs *** "RADFAX2" $35 is a high resolution, shortwave weather fax, Morse & RTTY receiving program . Needs CGA, SSB HF radio & Radfax decoder. Also "RF2HERC", "RF2EGA" & "RF2VGA", same as RADFAX2 but suitable for Card No. 94 SILICON CHIP FIX-A-KIT KIT REPAIR & CONSTRUCTION 3 MONTHS WARRANTY ON REPAIRS 12 MONTHS WARRANTY ON CONSTRUCTION TECHNICAL ASSISTANCE . HVCAL ELECTRONICS Design, Manufacture & Re pair of Electronic Equipment (02) 633 5477 Old Reprinted Electrical Books Build a 40,000 Volt Induction Coil ............ $9 Electrical Designs (1901) ...................... $19 Short Wave Radio Manual (1930) ......... $23 High Power Wireless Equipment (1911) $16 High Frequency Apparatus (1916) ........ $19 Build Short Wave Receivers (1932) ...... $13 Vision By Radio (1925) .......................... $16 1936 Radio Data Book .......................... $12 How to Become a Radio Amateur (1930) $6 All About Aerials ........................ .............. $5 Television (1938) ..................................... $5 Shortwave Coil Data Book (1937) ........... $5 1928 Radio Trouble-Shooting ................ $24 101 Short Wave Hook-Ups (1935) ........ $14 Vacuum Tubes in Wireless's .................. $21 Construction of Induction Coil ............... $21 Tesla: Man Out of Time (biography) ...... $22 Tesla Said, articles by Tesla 292pp ....... $74 My Inventions, by Nikola Tesla 111 pp ... $27 Dr. Nikola Tesla - Complete Patents ...... $93 Tesla Coil Secrets .................................. $13 How to Build a Solar Cell That Works ...... $9 Photocells and Their Application ........... $20 1914 Catalog Electro Importing Co ....... $14 r Prices as at March 20, 1992 SIMM & SIP HONEYWELL INDUSTRIAL Chart Recorders. 12-inch. $25 each or $40 for two. Phone (02) 925 4434 or (02) 428 2273 AH. 16 CHANNEL MIXER: this is the prototype unit, as described in the February to April issues of SILICON CHIP. Complete and going. $850. Phone Leo Simpson on (02) 979 5644. BARGAIN PRICED ITEMS: twin (stereo) VU meters $3; 4OkHz ultrasonic transducers $3 per pair; used O.52mW HeNe laser heads and tubes $25. Dual element pyroelectric detector plus Fresnel lens plus white filter plus circuit, $9. Mains filters in IEC socket plus a varistor, $5. Used collimated 5mW IR CO--PROCESSORS 256Kb x 9 80ns 1 Mb x 9 (9 chip) 80ns 1Mb x 9 (3 chip) 80ns 4Mb x 9 80ns 1Mbxg 100ns 1Mbx8 80ns $17.00 $55.00 $53.00 $215.00 $50.00 $45.00 8087-1 80287-12 80287-20 80387SX20 80387IX33 80287XLT Intel AMO IIT IIT IIT Intel EXPANSION CARDS $130.00 $105.00 $130.00 $168.00 $250 .00 $150.00 DRAM 1Mbx4 1Mbx4 1Mbx4 1Mbx 1 414256 41256 41256 41464 4164 "- r Allow 15 weeks for delivery of some items. Payment can be made by cheque made out to Plough Book Sales, PO Box 14, Belmont, Vic. 3216. Phone (052) 661262. Hercules, EGA & VGA cards respectively. $35. *** "SATFAX" $45 is a NOAA, Meteor & GMS weather satellite picture receiving program. Uses EGA & VGA modes, needs EGA or VGA colour monitor & card, plus "WEATHER FAX" PC card. $45. *** All programs are on 5.25inch or 3.5-inch discs (state which) & include documentation. Add $3 postage. Only from M. Delahunty, 42 Villiers St, New Farm, 4004 Old. Phone (07) 358 2785. "I MEMORY, DISKS & PROCESSORS ~ St Zip PgZip Pg Dip 80ns 80ns 100ns 80ns 80ns 100ns $30.00 $30.00 $30 .00 $5 .75 $6.80 $1.90 $2.00 $2.60 $2.50 PELHAM TOSHIBA LAPTOP T1000SE T1600 T3100E T3100SX T3200 T5100 T5200 2Mb 2Mb 2Mb 2Mb 3Mb 2Mb 2Mb $265.00 $145.00 $145.00 $145.00 $236.00 $145.00 $155.00 LCS 866IN (AT) EMS 512-32Mb (SIMMS) OK $240.00 BOCARAM AT PLUS OKTO 8Mb $240.00 BOCARAM AT OK TO 2Mb $180.00 BOCA PS2 MCA OK TO BK $180.00 ($60 per Mb) COMPAQ 386-20, 386-25,386-20S, 386-S, 386-33 4Mb modules $345.00 4Mb boards $400.00 Sales Tax 20%. Overnight delivery. Credit cards welcome. 1st Floor, 100 Yarrara Road (PO Box 382), Pennant Hills 2120. Tel (02) 980 6988 Fax (02) 980 6991 " UNIDEN SCANNERS DON'T PAY MORE! 50XL RRP $299.95. Our price $211 10 memories, Lo-Hi VHF, UHF 10OXLT RRP $449.95. Our price $409 100 memories, Lo-Hi VHF, Air, UHF 200XLT RRP $549.95. Our Price $477 200 memories, Lo-Hi VHF, Air, UHF, 800 MHz All prices include delivery. Phone anytime today1 (03) 883 9535; Fax (03) 432 0716 ~ DIGI-CART DSP BOARD For 16-bit IBM compatibles. Broadcast quality 44.1 kHz/16 bit stereo audio with audio recorder software. $1599 + Tax Custom software service for applications available. PC Computers (08) 332 6513 36 Regent St Kensington SA TopCom Communications PO Box 336, Greensborough, Vic 3088. ~ TRANSFORMER REWINDS ALL TYPES OF TRANSFORMER REWINDS TRANSFORMER REWINDS - Reply Paid No.2, PO Box 438, Singleton, NSW 2330. Ph: (065) 761291 . Fax: (065) 761003. Direct CAD PCB design from your schematic, rough PCB,to ink plot negative for prototype or one-off in sing I e or doub I e sided with s ii k screens & .so I der resist. NC and photoplot options avai I able on floppies. 7 Phone <02)807 6916 or wr I te 0 ~ ~ .C ~ G . F . & M . Hugfies ~ PO Box 37, Ryde PCB ART NSW, 2112 0 JO - laser diode assemblies (collimator pens), $35; 1OnF/3kV disc ceramics, 10 for $12; used regulated 15kV 5OOµA EHT power supplies, $45; 1mW 800nm IR LEDs at 10 for $3.50. Oatley Electronics, PO Box 89, Oatley 2223. Phone (02) 579 4985. Fax (02) 570 7910. quantity prices. Limited supply. Oatley Electronics, PO Box 89, Oatley, NSW 2223. Phone (02) 579 4985. Fax (02) 570 7910. NEW CRO TUBES & VALVES: 1-inch electrostatic deflection, type number CV1522 - $35; 3-inch spiral PDA electrostatic deflection, type numbers DP1O-6 and 4VP7 - $44; 3-inch magnetic deflection (no yoke supplied) PDA, type numberCV223O-$25; mercury vapour rectifier value, type 866A/866-$5; pentode valve, type 6C6 - $5. All items in original cartons. Enquire about reduced INFRARE;D NIGHT VIEWER: Not a complete kit but just the absolute essentials- an IR image converter tube and a ready-made power supply. The supply has approximate dimensions of 105 x 56 x 37mm, draws approx. 35mA from a 9V battery, and can power any IR tube. The tube may have some blemishes but will function properly. Basic instructions are provided. Give-away at $150 for the MAY 1992 95 r-------------------------, l SILICON CHIP BINDERS These beautifully-made binders will protect your copies of SILICON CHIP. They feature heavy-board covers and are made from a distinctive 2-tone green vinyl that will look great on your bookshelf. Advertising Index Adilam Electronics ........ ..... ...... IFC All Electronic Components ........ 71 Altronics .... ....... ........ .......... .. 72-75 Antique Radio Restorations .. .... 94 Av-Comm ....................... ........ ... .. 8 Breakthrough Electronics ... .. ..... 25 * High quality. * Hold up to 14 issues David Reid Electronics ... ............. 3 Dick Smith Electronics ...... 9,27-29 * 80mm internal width. Emona Instruments ................ ... 55 Geoff Wood Electronics .............. 5 * SILICON CHIP logo printed in gold- G. F. & M. Hughes ................ .... . 95 coloured lettering on spine & cover. Harbuch Electronics ............... ... 42 Yes! Please send me ____ SILICON CHIP binder(s) at $A11.95 plus $A3 p&p each (NZ $A6 p&p). Hycal Instruments ............. ... 25,94 Enclosed is my cheque/money order for $_ _ _ _ or please debit my Jaycar Electronics ................ 45-52 □ Bankcard O Visa Card lcom Australia .. .... ...... .... ... ...... IBC J.V. Tuners .... .. .. ........................ 42 O Master Card Mark One Communications ..... . 39 Oatley Electronics .. .. ....... ... .. 57,95 Card No. L_____L_L___j____JI I~ '----'--'--..JI I~ L___j____J'-----.. JI ~I '---..J'-----..- - ' PC Computers .............. ... .. .... ... 95 PC Marketplace ... ... ... .. ....... ...... 21 Signature._ __ _ _ _ __ _ _ _ _ Card expiry date._ _ _ /_ __ Pelham ... .... .... ................... OBC,95 Name _ _ __ __ _ _ __ _ _ __ _ _ _ _ _ _ _ _ __ Peter C. Lacey Services ........... 40 Plough Book Sales .. ... ............... 95 Street - - - - -- - -- - - -- - -- - - - -- - - - Suburb/town _ _ _ _ _ _ _ _ _ _ _ _ Postcode_ _ _ _ __ Preston Electronics ................... 56 Protel Technology ... .................. 39 RCS Radio ... ............................. 54 Resurrection Radio .... .. .... ......... 71 SILICON CHIP PUBLICATIONS PO Box 139, Collaroy Beach, NSW 2097, Australia. Phone (02) 979 5644 Fax: (02) 979 6503. L _________________________ J Rod Irving Electronics .. .... .... 10-15 Rolec Pty Ltd .. .... .... .............. 66-67 Silicon Chip Back Issues ..... 88-89 Silicon Chip Binders ....... ........... 96 St Lucia ....................................... 7 pair. 75mm perspex IR filter, $16. Major cards accepted with phone & fax orders. Certified p&p for any or all the listed items: Australia $5; NZ (airmail) $10. Oatley Electronics, PO Box 89, Oatley, NSW 2223. Phone (02) 579 4985. Fax (02) 570 7910. Circuit Ideas Wanted Do you have a good circuit idea languishing in the ol ' brain cells? If so, why not sketch it out, write a brief description & send it to us We'll pay up to $60 for a really good circuit. So transfer your circuit to paper & send it to Silicon Chip Publications, PO Box 139, Collaroy Beach, NSW 2097. 96 SILICON CHIP WANTED TECS Electronics & Computers 61 Transformer Rewinds ... ........... .. 95 PERSON TO REPAIR Macintosh 512K power supply fault. Phone (03) 398 2486 (Bus) or (03) 742 6093 (AH) . TopCom Communications ........ . 95 CIRCUIT/MANUAL for Printed circuit boards for SILICON CHIP projects are made by: PC Boards National NV450A video recorder, TC2252 CTV. Phone (077) 72 8572 BH, (079) 52 3737 weekends. DISTORTION TEST SET wanted to buy. Must be auto-nulling and with instruction manuals. Can be Audio Precision , Sound Technology 170x, Hewlett Packard 339 or equivalent standard. If you have one to sell, please contact Leo Simpson on (02) 979 5644 with details and price. • Jemal Products, 5 Forge St, W~lshpool, WA 6106. Phone (09) 350 5555. • Marday Services, PO Box 19-189, Avondale, Auckland, NZ. Phone 88 5730. • RCS Radio Pty Ltd, 651 Forest Rd, Bexley, NSW 2207. Phone (02) 587 3491.